FprEN ISO 10318-2
(Main)Geosynthetics - Part 2: Symbols and pictograms (ISO/FDIS 10318-2:2026)
- Abstract
The intent of ISO 10318-2:2015 is to define property symbols, graphical symbols, and pictograms used in EN and ISO geosynthetics standards. Definitions of particular or specific symbols and pictograms terms not included in this this part of ISO 10318 can be found in the International Standards describing appropriate test methods.
- Status
- Not Published
- Publication Date
- 03-Mar-2027
- Technical Committee
- CEN/TC 189 - Geotextiles and geotextile-related products
- Current Stage
- 4599 - Dispatch of FV draft to CMC - Finalization for Vote
- Start Date
- 13-Oct-2026
- Completion Date
- 13-Oct-2026
FprEN ISO 10318-2 is the CEN reference for the ISO geosynthetics standard on symbols and pictograms. It specifies the property symbols, graphical symbols and pictograms used in EN and ISO geosynthetics standards, so engineers, laboratories and specifiers can describe products and test results with the same notation.
What does FprEN ISO 10318-2 specify?
FprEN ISO 10318-2 defines the symbol set used for geosynthetics terminology and graphical identification. It also points users to the relevant test method standards when a particular symbol or pictogram term needs a more specific definition.
The document is organized into a short scope, then Clause 2 on symbols. Clause 2 is split into property symbols and graphical symbols and pictograms, followed by a bibliography.
| Part of Clause 2 | What it covers |
|---|---|
| 2.1 Property symbols | Physical, hydraulic, mechanical, frictional, loading and other characteristics |
| 2.2 Graphical symbols and pictograms | Product symbols, function symbols and application symbols |
What are the key requirements of FprEN ISO 10318-2?
FprEN ISO 10318-2 standardizes the notation used for geosynthetics properties and graphical identification. In practice, this means drawings, test reports, product data sheets and standards can use the same symbols without ambiguity.
Property symbols in Clause 2.1
Clause 2.1.1 gives symbols for basic physical properties such as thickness, width, length and mass per unit area. These are the core dimensions used when describing a geosynthetic product.
Clause 2.1.2 covers hydraulic properties, including coefficient of permeability, permittivity, transmissivity, velocity index, in-plane flow capacity, flux normal to the plane and characteristic opening size. These symbols matter when comparing drainage, filtration and flow behavior.
Clause 2.1.3 groups the mechanical symbols. It covers tensile characteristics at yield, at a given strain, at failure and at maximum stress, plus tensile modulus, joint or seam strength and joint or seam efficiency. It also includes frictional characteristics, loading characteristics and the diameter of a hole obtained in the cone drop test.
Graphical symbols and pictograms in Clause 2.2
Clause 2.2 standardizes graphical symbols for geosynthetics products, functions and applications. That helps users label technical documents and system diagrams in a consistent way.
| Category | Examples named in the standard |
|---|---|
| Products | GTX, GBR, GGR, GCO, GNT, GBR-C, GCE, GMA, GFO, GCC, GCT, GSP, GST, GCP, GBL |
| Functions | Separation, barrier, filtration, drainage, reinforcement, surface erosion control, protection, stress relief, stabilization |
| Applications | Reservoirs and dams, liquid waste, canals, solid waste, transportation infrastructure and roads, foundations and retaining walls, railways, tunnels and underground structures, drainage systems, coastal erosion control, asphalt reinforcement, secondary containment, waterproofing of underground structures |
What terms does FprEN ISO 10318-2 define?
FprEN ISO 10318-2 uses a small set of technical terms to keep hydraulic and mechanical data consistent.
- Permittivity - the symbol for flow through the material normal to its plane, used when describing filtration performance.
- Transmissivity - the symbol for flow capacity in the plane of the material, important for drainage design.
- Velocity index - the symbol for the hydraulic velocity-related property used in geosynthetics reporting.
- In-plane flow capacity - the symbol used for flow carried along the plane of the material.
- Flux normal to the plane - the symbol for flow crossing the material thickness.
- Characteristic opening size - the symbol for the opening-size property used in filtration-related descriptions.
- Joint or seam efficiency - the symbol for comparing seam performance with the parent material.
- Friction interaction coefficient - the symbol for soil-to-geosynthetic friction behavior.
Who uses FprEN ISO 10318-2?
FprEN ISO 10318-2 is used by geosynthetics manufacturers, testing laboratories, designers, specifiers and standards writers. It is especially useful in roads, railways, tunnels, retaining walls, dams, drainage systems, erosion control and containment applications.
These users rely on the standard when writing product literature, preparing test reports, comparing materials, checking seam performance, and marking functions or applications on technical documents. Using the same symbols reduces confusion between design, testing and procurement teams.
What changed in FprEN ISO 10318-2 from the previous edition?
FprEN ISO 10318-2 is the third edition and it cancels and replaces ISO 10318-2:2015. The foreword states that this edition has been technically revised.
Which standards are used with FprEN ISO 10318-2?
FprEN ISO 10318-2 repeatedly refers to ISO 10318-1 for the underlying vocabulary and for the reference numbers attached to many symbols. That companion part provides the base terms behind thickness, hydraulic properties and mechanical properties.
The bibliography also cites ISO 9863-1:2016, which covers thickness determination at specified pressures for single layers. That reference supports the thickness symbol used in the property table.
What does the FprEN ISO 10318-2 document contain?
FprEN ISO 10318-2 contains a table-based symbol system rather than test methods. Clause 2.1 lists symbols, units and references for physical, hydraulic, mechanical, frictional, loading and other properties, while Clause 2.2 lists graphical symbols for products, functions and applications.
The document also gives the formulas attached to some hydraulic symbols, such as the relationships used for permittivity and transmissivity. The bibliography links the symbol set to related measurement standards, which helps users trace a symbol back to the method used to obtain the value.
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 08-Nov-2023
- Effective Date
- 08-Nov-2023
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Frequently Asked Questions
FprEN ISO 10318-2 is a draft published by the European Committee for Standardization (CEN). Its full title is "Geosynthetics - Part 2: Symbols and pictograms (ISO/FDIS 10318-2:2026)". This standard covers: The intent of ISO 10318-2:2015 is to define property symbols, graphical symbols, and pictograms used in EN and ISO geosynthetics standards. Definitions of particular or specific symbols and pictograms terms not included in this this part of ISO 10318 can be found in the International Standards describing appropriate test methods.
The intent of ISO 10318-2:2015 is to define property symbols, graphical symbols, and pictograms used in EN and ISO geosynthetics standards. Definitions of particular or specific symbols and pictograms terms not included in this this part of ISO 10318 can be found in the International Standards describing appropriate test methods.
FprEN ISO 10318-2 is classified under the following ICS (International Classification for Standards) categories: 01.080.99 - Other graphical symbols; 59.080.70 - Geotextiles. The ICS classification helps identify the subject area and facilitates finding related standards.
FprEN ISO 10318-2 has the following relationships with other standards: It is inter standard links to ISO/FDIS 10318-2, EN ISO 10318-2:2015/A1:2018, EN ISO 10318-2:2015. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN ISO 10318-2 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Geosintetika - 2. del: Simboli in piktogrami (ISO/DIS 10318-2:2025)
Geosynthetics - Part 2: Symbols and pictograms (ISO/DIS 10318-2:2025)
Geokunststoffe - Teil 2: Symbole und Piktogramme (ISO/DIS 10318-2:2025)
Géosynthétiques - Partie 2: Symboles et pictogrammes (ISO/DIS 10318-2:2025)
Ta slovenski standard je istoveten z: prEN ISO 10318-2
ICS:
01.040.59 Tekstilna in usnjarska Textile and leather
tehnologija (Slovarji) technology (Vocabularies)
01.080.01 Grafični simboli na splošno Graphical symbols in general
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 10318-2
ISO/TC 221
Geosynthetics —
Secretariat: BSI
Part 2:
Voting begins on:
Symbols and pictograms 2025-10-15
Voting terminates on:
Géosynthétiques —
2026-01-07
Partie 2: Symboles et pictogrammes
ICS: 01.080.99; 59.080.70
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 10318-2:2025(en)
DRAFT
ISO/DIS 10318-2:2025(en)
International
Standard
ISO/DIS 10318-2
ISO/TC 221
Geosynthetics —
Secretariat: BSI
Part 2:
Voting begins on:
Symbols and pictograms
Voting terminates on:
Géosynthétiques —
Partie 2: Symboles et pictogrammes
ICS: 01.080.99; 59.080.70
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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Published in Switzerland Reference number
ISO/DIS 10318-2:2025(en)
ii
ISO/DIS 10318-2:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Symbols . 1
2.1 Property symbols.1
2.1.1 Physical properties.1
2.1.2 Hydraulic properties of GTX and of GTP .1
2.1.3 Mechanical properties . .2
2.2 Graphical symbols and pictograms .3
2.2.1 Products .3
2.2.2 Functions .3
2.2.3 Applications .4
Bibliography . 7
iii
ISO/DIS 10318-2:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Stand
...